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<head>
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // let obj = Object();

        // obj.name = '张三';
        // obj.age = 18;
        // obj.sex = '男';
        // console.log(obj);
        // (obj);
        // obj.show();
        // document.write('<br>');
        // delete obj.name;
        // obj.show();
        
        // document.write('<br>');
        // obj["123@#$%"] = "这是个属性";
        // document.write(obj["123@#$%"]);
        
        
        document.write('<br>');
        let man = Object();
        man.name = '张三';
        man.age = 18;
        man.sex = '男';

        console.log(man);
        

        console.log("name" in man);
        console.log("name1" in man);
        

        let num = {"Number": 123, "String": "hello", "Boolean": true};

        console.log(num);
        
    </script>
</head>
<body>
    
</body>
</html>